Method and apparatus to monitor an output speed sensor during operation of an electro-mechanical transmission
First Claim
1. Method to monitor a sensing system configured to monitor rotational speed of an output shaft of an electro-mechanical transmission, comprising:
- monitoring rotational speed of a wheel operatively connected to a driveline operatively connected to the output shaft of the electro-mechanical transmission;
determining a first expected rotational speed of the output shaft of the transmission based upon the rotational speed of the wheel;
determining rotational speeds of first and second electric machines operatively connected to the transmission;
calculating a second expected rotational speed of the output shaft of the transmission based upon the rotational speeds of first and second electric machines when the electro-mechanical transmission is operating in a continuously variable operating mode;
comparing the first and second expected rotational speeds of the output shaft and a signal output from the sensing system configured to monitor rotational speed of the output shaft of the electro-mechanical transmission; and
wherein comparing the first and second expected rotational speeds of the output shaft and the signal output from the sensing system configured to monitor the rotational speed of the output shaft of the electro-mechanical transmission further comprises;
averaging the first and second expected rotational speeds of the output shaft of the transmission; and
comparing the signal output from the sensing system to the average of the first and second expected rotational speeds of the output shaft of the transmission.
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Accused Products
Abstract
There is provided a method to monitor a sensing system adapted to monitor an output of an electro-mechanical transmission. This includes monitoring rotational speed of a wheel operatively connected to a driveline operatively connected to the output of the electro-mechanical transmission. A first expected output of the transmission is determined based upon the output of the first sensor. A second expected output of the transmission is determined based upon a rotational speed of a torque-generative device operatively connected to the transmission. The first and second expected outputs and an output of the sensing system adapted to monitor the output of the electro-mechanical transmission are compared.
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Citations
15 Claims
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1. Method to monitor a sensing system configured to monitor rotational speed of an output shaft of an electro-mechanical transmission, comprising:
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monitoring rotational speed of a wheel operatively connected to a driveline operatively connected to the output shaft of the electro-mechanical transmission; determining a first expected rotational speed of the output shaft of the transmission based upon the rotational speed of the wheel; determining rotational speeds of first and second electric machines operatively connected to the transmission; calculating a second expected rotational speed of the output shaft of the transmission based upon the rotational speeds of first and second electric machines when the electro-mechanical transmission is operating in a continuously variable operating mode; comparing the first and second expected rotational speeds of the output shaft and a signal output from the sensing system configured to monitor rotational speed of the output shaft of the electro-mechanical transmission; and
wherein comparing the first and second expected rotational speeds of the output shaft and the signal output from the sensing system configured to monitor the rotational speed of the output shaft of the electro-mechanical transmission further comprises;
averaging the first and second expected rotational speeds of the output shaft of the transmission; and
comparing the signal output from the sensing system to the average of the first and second expected rotational speeds of the output shaft of the transmission. - View Dependent Claims (2, 3, 4)
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5. Method to detect a fault in a sensor and target wheel adapted to monitor rotational speed of an output shaft of an electro-mechanical transmission, comprising:
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monitoring rotational speed of a wheel operatively connected to a driveline operatively connected to the output of the electro-mechanical transmission; determining a first expected output of the transmission based upon the rotational speed of the wheel; determining a second expected output of the transmission based upon a rotational speed of a torque-generative device operatively connected to the transmission; comparing an output of the sensor with the first and second expected outputs of the transmission; and identifying a fault in the output of the sensor when the first and second expected outputs of the transmission differ by less than a predetermined threshold, and, the output of the sensor differs from an average of the first and second expected outputs of the transmission by greater than a predetermined threshold. - View Dependent Claims (6, 7, 8)
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9. Method to control operation of a powertrain adapted to transmit power to a wheel via a driveline, the powertrain comprising an internal combustion engine operatively connected to an electro-mechanical transmission selectively operative in one of fixed gear and continuously variable operating modes, the method comprising:
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monitoring rotational speed of the wheel operatively connected to the driveline operatively connected to an output of the transmission; determining a first expected output of the transmission based upon the rotational speed of the wheel; determining a second expected output of the transmission based upon a rotational speed of a torque-generative device operatively connected to the transmission; comparing the first and second expected outputs and an output of a sensing system adapted to monitor rotational speed of the output of the transmission; identifying a fault in the sensing system adapted to monitor the rotational speed of the electro-mechanical transmission when the output of the sensing system differs from an average of the first and second expected outputs of the transmission by less than a predetermined threshold; and
,controlling operation of the transmission based upon the first expected output of the transmission when a fault is identified. - View Dependent Claims (10, 11, 12, 13, 14, 15)
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Specification